How can you tell when an ink cartridge to a HP 770c is empty? -

Besides that is doesn t print. I just purchased 2 cartridges, (black and color) and it only printed 3 times and then no more! Was I jyped?

have you allowed them to sit unused for an extended period of time (more than 1 month)? if this is the case then the cartridges are dry. You can run a couple print head cleanings to hopefully bring back the print quality. If you purchased a re manufactured or refilled cartridge they could dry in less time as the ink quality is not as good as the HP originals. You were mostly likely not gypped, you probably just don t use the printer frequently.

Wow, I think you were, is it having errors! You could also have a leak?

Try cleaning your print heads. Go into your printers properties and run through the tests it provides and see how things work out. If they are remanufactured cartridges their is a good chance they are duds.